The 'leave' campaign:

Supporters of 'Brexit' - a merger of the words Britain and exit - have argued that the EU takes too much cash from Britain but offers too little in return.

They claim the EU imposes too much red tape which holds back UK businesses.

Brexit supporters have also argued that leaving the EU will allow Britain to take control of its borders and reduce the number of immigrants coming to Britain.

Brexit campaigners have also raised fears of the unification of Europe as a single sovereign federation of states.

The Vote Leave campaign says that the EU has too much power.

A spokesman said that voting 'leave' will "end the supremacy of EU law" and mean "we stop spending £350 million every week to Brussels and instead spend it on our priorities, like the NHS and science research."

"A vote to 'leave' and a better, friendlier relationship with the EU is much safer than giving Brussels more power and money every year."

Campaigners say that voting to leave will allow Britain to do trade deals with countries including the USA, Japan and India, and elsewhere, which will create around 300,000 jobs.

The 'stay' campaign:

Lord Mandelson delivers a keynote speech during an event hosted by the Britain Stronger In Europe campaign

Supporters of the EU say that membership makes it easier for British businesses to sell things to other EU countries, as well as benefiting the economy by providing a flow of young workers from across the Continent.

'Stay' campaigners have claimed that leaving the EU will damage the country's reputation across the world.

The Britain Stronger in Europe campaign group has argued that workers' rights are protected by the EU and EU law also protects women's rights.

The campaign's website lists "10 ways being in the EU strengthens UK defence".

It claims that membership "gives UK influence over EU foreign and security policy" and "reduces demands on UK military".

The campaign says that being in the EU helps fight climate change and tackle humanitarian crises.

It has taken issue with the claim that the UK sends £350m a week to the EU.

Lucy Thomas, deputy director of Britain Stronger in Europe, said the "flagship statistic has been repeatedly declared to be misleading."